How can I offset the start of a fluid simulation
You should use the offset field in the domain's settings:



What you would normally want is a negative offset. For example, if the camera switches at frame #240 (10 seconds at 24fps), the offset should be -240. Blender will skip the first 240 frames. It only starts doing the simulation at frame 240. 

Here is an example of an offset at frame 350 (60fps):

Frame #349:


Frame #350